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<p>
  Compare two version numbers with each other.
  See <a href="https://github.com/jenkinsci/lib-version-number/blob/master/src/main/java/hudson/util/VersionNumber.java">VersionNumber.java</a>
  for how version strings are handled.
</p>
<p>
  The return value is an Integer;
  <ul>
    <li><code>-1</code> if <code>v1 &lt; v2</code></li>
    <li><code>0</code> if <code>v1 == v2</code></li>
    <li><code>1</code> if <code>v1 &gt; v2</code></li>
  </ul>
</p>
